protected function onSuccess(ParticipateTrip $participateTrip)
 {
     $participateTrip->setDateInscription(new \DateTime());
     $operation = new Operation();
     $operation->setDate(new \DateTime());
     $operation->setDescription("New payment for the trip : " . $participateTrip->getTrip()->getName());
     $operation->setLibelle("Payment for a trip");
     $operation->setMontant($participateTrip->getTrip()->getPrice());
     $montant = $this->em->getRepository('ESNTreasuryBundle:Caisse')->getLastCaisse();
     $caisse = new Caisse();
     $caisse->setMontant($montant + $operation->getMontant());
     $this->em->persist($caisse);
     $this->em->persist($operation);
     $this->em->persist($participateTrip);
     $this->em->flush();
 }